Spring attachment for teeth of agricultural implements.



L. WILLIS & 0. P. WOODWORTH.

SPRING ATTACHMENT FOR TEETH or AGRICULTURAL IMPLEMENTS.

APPLICATION FILED JULY 28, 1911.

Patented Sept. 26, 1911.

2 sums-sum 1.

INVENTORS WITNESSES 76 -M MMJZMAQ D NHH AT R m $1 mm wm E m A T Lm VIwas COLUMBIA PLANOGIIAPN CO" WASHINGTON, D. C.

L. WILLIS & 0. P. WOODWORTH. SPRING ATTACHMENT ron TEETH OF AGRICULTURALIMPLEMENTS.

APPLICATION FILED JULY 28, 1911.

1,004,224. Patented Sept. 26, 1911.

INVENTORS LELAND WILLIS AND OLIN E WOODWORTH BY THE"? ATTORNEY WITNESSESCOLUMBIA PLANDfllAPll c0.. WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

LELAND WILLIS AND OLIN F. WOODWORTI-I, OF GRENLOGH, NEW JERSEY,ASSIGNORS TO BATEMAN MANUFACTURING CQMPANY, OF GRENLOCH, NEW JERSEY, AGORPO- RATION OF NEW JERSEY.

SPRING- ATTACHMENT FOR TEETH OF AGRICULTURAL IMPLEMENTS.

Specification 01 Letters Patent.

Application filed July 28, 1911.

To all whom it may concern:

Be it known that we, LELAND WILLIS and OLIN F. Woonwonrrr, both citizensof the United States, residing in Grenloch, New Jersey, have inventedcertain Improvements in Spring Attachments for Teeth of AgriculturalImplements, of which the following is a specification.

-Our invention relates to spring mountings for the teeth of harrows,hoes, or like agricultural implements, one object of our invention beingto so construct such spring mountingthat the various pivotal points ofthe same cannot, when the tooth is in its normal or operative position,assume such relation to one another as to prevent the tooth fromyielding when it meets with any obstruction or prevent the tooth fromresuming its normal position again after it has been swung rearwardly bysuch obstruction and has cleared the same, a further object being toinsure the effective action of the spring in all of the positionsassumed by the tooth in its swinging movement, and a still furtherobject being to reduce the number of parts adjustable by the user to butone, namely, that whereby the tension of the spring is regulated. Theseobjects we attain in the manner hereinafter set forth, reference beinghad to the accompanying drawings, in which- Figure 1 is a view, partlyin side elevation and partly in section, of a spring mountingconstructed in accordance with our invention, the tooth being shown inits normal or operative position; Fig. 2 is a similar view illustratingthe tooth in the position assumed by it when it has been swungbackwardly in order to clear an obstruction; Fig. 3 is a horizontalsection on the line AA, Fig. 1; Fig. 4: is a partial transverse sectionon the line BB, Fig. 1, and Figs. 5 and 6 are side views of two of themembers of the device.

In the drawings, 1 represents a bar depending from the main frame of themachine and 2 the tooth which is to be yieldingly mounted thereon, thistooth being fixedly secured to the lower member of a lever arm 3 whichis pivotally mounted at 4 upon the lower end of the bar 1, the uppermember of the said lever arm 3 being forked so as to embrace the bar 1and being connected by a pivot pin 5 to the front ends of the pair oflinks 6, whose rear ends are pivoted by means of a pin 7 to the rearportions of a pair of wings 9 depending from a spring supporting cup 10,the front ends of said wings 9 being pivoted by means of a pin 11 to abracket 12 fixedly mounted upon and projecting rearwardly from the bar1, as shown in Figs. 1 and 2. The spring 13 is seated in the cup 10 andhas at its upper end a cap plate 14: having a central threaded openingfor the reception of the threaded upper end of a rod.15, whose lower endis formed into an eye which embraces a pin 16 carried by a block 17, thelatter being pivotally mounted upon the pin 7, as shown in Figs. 1 and2. The block 17 has side shoulders 19 which hear at all times againstthe undersicles of the side links 6 and the cup 10 has shoulders 20against which the upper faces of the side links abut when the tooth 2 isin its normal or operative position, as shown in Fig. 1, the tension ofthe spring 13 tending to maintain the parts in this position. When thuslocated the side links 6, the side wings 9 of the spring cup 10 and thethree pivot pins 5, 7 and 11 constitute a toggle, the axis of thecentral pivot pin 11 occupying a position slightly above a line drawnthrough the axes of the pins 5 and 7 so that if a forward pull isexerted upon the pin 5 the toggle can break, the rear pin 7 descendingand the spring cup 10 swinging downwardly upon the pin 11 as a pivot.If, however, the rearward swing of the tooth 2, when it came in contactwith an obstruction which it could not throw aside, was such force as toimpart a direct forward pull to the pin 5 the breaking of the togglewould require the expenditure of more force than it is advisable toexert, hence our use of the lever arm 3 upon which the tooth 2 ismounted, so that when said tooth is forced rearthe shoulders 19 on theblock 17 causes the latter to swing downwardly with them, therebycausing compression of the spring 13 through the intervention of the rod15 and cap 14, as shown in Fig. 2, rearward swinging movement of thetooth 2 being permitted until the lever arm 3 comes into contact withstop lugs 21 on the block 17, as

shown in Fig. 2, by which time the tooth will have cleared anyobstruction which in the operation of the tool or implement it is likelyto strike and which it cannot displace. As soon as the tooth clears theobstruction the spring 13 will expand and restore the parts to theirnormal position, as shown in Fig. 1, the upper faces of the links 6finally contacting with the shoulders 20 on the spring cup 10. As thetoggle straightens, however, the power of the spring is exerted withless and less force, consequently, although the tooth is returnedquickly from its displaced to its normal position, the latter part ofthe operation is so slow that the links 6 come in contact with theshoulders 20 without the exercise of any considerable degree of forceand therefore without causing any injurious shock or jar to any of theparts.

The shoulders 20 on the spring cup 10 serve as a guide for setting saidcup in the jig whereby the openings are bored or drilled in the wings 9for the reception of the pivot pins 7 and 11, so that the latter pinwill always bears its proper relation to the pins 7 and 5, when theparts are in the position shown in Fig. 1, there being no possibility ofthe three pins coming into line with one another so as to prevent thebreaking of the toggle when the forward pull is exerted upon the links6.

When the tooth 2 is swung backward the lever arm 3, links 6 and springcup 10 constitute another toggle having the three pivots 4, 5 and 7, andthe stop lugs 21 on the block 17 prevent the lever arm 3 from swingingso far backward as to bring these three pivot pins in line, and thuslocking the parts. In this respect our invention is an improvement uponthat class of spring mountings which employ a set screw or otheradjustable stop for changing the relative position of toggle centerswhich regulate the amount of force necessary to break the toggle inorder that the tooth may clear 1. The combination, in a spring mountingfor teeth of agricultural implements, of the fixed bar, a lever armpivoted thereto and carrying the blade or tooth, a spring-supporting cuppivotally mounted on the fixed bar, a spring mounted in said cup, linksconnecting the tooth-carrying lever arm to said spring cup, and a blockconnected to the spring and pivoted to the spring-supporting cup and tothe links, said block having shoulders upon which the links bear,whereby, under the tension of the spring, it is maintained in constantcontact with said links.

' 2. The combination, in a spring mounting for teeth of agriculturalimplements, of the fixed bar, a lever arm pivoted thereto and carryingthe blade or tooth, a spring-supporting cup pivotally mounted on thefixed bar, a spring mounted in said cup, links connecting thetooth-carrying lever arm to said spring cup, and a block connected tothe spring and pivoted to the spring-supporting cup and to the links,said block having shoulders upon which the links bear, whereby, underthe tension of the spring, it is maintained in constant contact withsaid links, and said block being provided with stop lugs which serve tolimit the rearward swinging movement of the tooth-carrying lever arm.

3. The combination, in a spring mounting for teeth of agriculturalimplements, of the fixed bar, a lever arm pivoted thereto and carryingthe blade or tooth, a spring-supporting cup pivotally mounted on thefixed bar, a spring mounted in said cup, links connecting thetooth-carrying lever arm to said spring cup, and a block connected tothe spring and pivoted to the spring-supporting cup and to the links,said block having shoulders upon which the links bear, whereby, underthe tension of the spring, it is maintained in constant contact withsaidlinks, and the spring-supporting cup being provided with shoulderswhich contact with the links when the tooth is in its normal oroperative position.

4. The combination, in a spring mounting for the tooth or blade of anagricultural implement, of the fixed bar, a lever arm pivoted theretoand carrying the blade or tooth, a spring-supporting cup pivotallymounted on the arm, a spring mounted in said cup, and links connectingsaid tooth-carrying lever arm to said spring-supporting cup, saidmembers constituting a toggle having three names to this specification,in the presence pivotal connections so disposed that when of twosubscribing witnesses.

the tooth is in the normal or operative po- LELAND WILLIS. sition theaxis of the central pivot is above a OLIN F. WOODWORTH. 5 line drawnthrough the axes of the front and WVitnesses:

rear pivots. HARRY SNYDER, In testimony whereof, We have signed our L.F. TYSON. 1

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

